Here’s a really interesting talk about how to use Guice, a new open source dependency injection framework for Java by Google. Here’s a link to the user-guide which explains, using a example, why Guice might be a great alternative to using static references, or factory patterns when writing unit tests. I haven’t used Guice yet but i have written many unit tests for services that need to pass in Mocked services using the factory pattern, so I can immediately see the benefit of a framework like Guice.

I’m going to delve deeper into it, but I recommend watching the tech talk, they work through a simple example and it does sound very useful.